Due to the improvement of steel properties, many steel structures with attractive appearance emerge unceasingly. In this article, a new structure of steel octagon-web beam which has the similar appearance with honeycomb beam was presented. The mechanical characteristics of steel octagon-web beam under bending loads were analyzed theoretically. Based on the Vierendeel truss theory in deflection calculation of honeycomb beam, the deflection calculation method of steel octagon-web beam which was validated by finite element method was studied. Two parameters affecting deflection of steel octagon-web beam, such as opening type and expansion ratio, were analyzed. A scale model of steel octagon-web beam was manufactured in order to study bending behavior of the structure. The failure patterns of test specimen under four-point bending test are the buckling of deck and web. A nonlinear finite element model of test specimen whose results were compared with test was established by software ABAQUS 2017. The stresses of slabs under ultimate load have reached yield stress, which shows steel octagon-web beam has good flexural performance.

中文翻译：

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八边形腹板钢梁的弯曲行为

由于钢材性能的提高，许多外观精美的钢结构不断涌现。本文介绍了一种外形与蜂窝梁相似的八角腹钢梁的新型结构。从理论上分析了八角腹钢梁在弯曲载荷作用下的力学特性。基于蜂窝梁挠度计算中的Vierendeel桁架理论，研究了经有限元验证的八角腹钢梁挠度计算方法。分析了影响钢八角腹梁挠度的两个参数，如开口类型和膨胀比。为了研究结构的弯曲行为，制作了八角形腹板钢梁的比例模型。四点弯曲试验试件的破坏形式为桥面板和腹板的屈曲。用ABAQUS 2017软件建立试件非线性有限元模型，并与试验结果进行对比，板坯在极限荷载作用下的应力均达到屈服应力，表明八角腹钢梁具有良好的抗弯性能。